raft: makes 'ConnReadTimeout/ConnWriteTimeout' customizable

server/etcdserver/api/rafthttp/peer.go

@@ -37,8 +37,8 @@ const (
 	// to keep the connection alive.
 	// For short term pipeline connections, the connection MUST be killed to avoid it being
 	// put back to http pkg connection pool.
-	ConnReadTimeout  = 5 * time.Second
-	ConnWriteTimeout = 5 * time.Second
+	DefaultConnReadTimeout  = 5 * time.Second
+	DefaultConnWriteTimeout = 5 * time.Second
 
 	recvBufSize = 4096
 	// maxPendingProposals holds the proposals during one leader election process.
@@ -55,6 +55,11 @@ const (
 	sendSnap    = "sendMsgSnap"
 )
 
+var (
+	ConnReadTimeout  = DefaultConnReadTimeout
+	ConnWriteTimeout = DefaultConnWriteTimeout
+)
+
 type Peer interface {
 	// send sends the message to the remote peer. The function is non-blocking
 	// and has no promise that the message will be received by the remote.